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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jclouds.ec2.binders;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import jakarta.inject.Singleton;

import org.jclouds.aws.util.AWSUtils;
import org.jclouds.http.HttpRequest;
import org.jclouds.rest.Binder;

import com.google.common.collect.Iterables;

/**
 * Binds the Iterable to query parameters named with UserGroup.index
 */
@Singleton
public class BindUserGroupsToIndexedFormParams implements Binder {
   @Override
   public  R bindToRequest(R request, Object input) {
      checkArgument(checkNotNull(input, "input") instanceof Iterable, "this binder is only valid for Iterable: "
            + input.getClass());
      checkValidUserGroup(input);
      return AWSUtils.indexIterableToFormValuesWithPrefix(request, "UserGroup", input);
   }

   private void checkValidUserGroup(Object input) {
      Iterable values = (Iterable) input;
      long size = Iterables.size(values);
      checkArgument(size == 0 || (size == 1 && Iterables.getOnlyElement(values).equals("all")),
            "only supported UserGroup is 'all'");
   }

}